You might have spawned "underground", check the hight level you are in. And I heard that building a nether portal on the surface of the overworld can prevent these things from happening.
Tekkit does not effect normal minecraft, it has a separate folder, so you can still play normal minecraft while playing tekkit.
And yes, you are totally in the wrong place.
I doubt search will help, it's impossible to play with thaumcraft without the vis/taint function and there's no way to disable it, all the blocks and items in thaumcraft are somehow related to them. Though it is possible to disable natural taint spawn in the config, note that taint will still occur if the taint level is high enough.
Would you like a server where people can just steal all your stuff, blow up your house, trap you into a cage then kill you, and turn off the cooling system in your nuclear reactor?
Try to use the caterpiller design, with upper and lower frame sections. A frame motor will move the upper part of the frame for one block, then the lower part immediately moves by a another frame motor,that gets you a frame airship which can travel infinitely.
Which youtube video? and what kind of game you want?
A lot of people disabled thaumcraft because the taint function, some people disabled mo'creatures. And that's about it, disable other mods would ruin the experince.
Here, I shall bring some news about what 1.4 minecraft is going to add.
-placeable items, hangable maps
-armoured zombies, baby zombies
-villagers can now be infected and become a villager zombie
-plant pots, stone fences
-remove herobrine(as always)
Joking aside, I agree with you that aliens would never visit us as a intellgent species, even if they found us, they will probalay just see us as some animals.